We are using a Powerflex 753 VFD to control a motor which lifts and descends loads. The drive goes into fault code 12 (HW Overcurrent) and code 36 (SW Overcurrent) multiple times while its descent in the loaded condition. The drive does not go into fault when:
1. It ascends or descends in no load.
2. Ascends in load condition.
Therefore the fault occurs only in one direction under loaded condition.
I have google searched and tried changing a few parameters [Parameter 43 (Flux Up Enable) and Parameter 44 (Flux Up Time), Parameter 70 (Autotune) and Parameter 621 (Slip RPM at FLA) to 0], but it didn't affect the faults.
Any ideas why? Any solutions?
On the PowerFlex 755T if the converter current limit is set to zero a Fault 13068 SW Bus Over Volt See Tech note: 1071031-PowerFlex755T - Drive Sets Current Limit to Zero If your inverter is being powered by an active front end, the PE-B jumper must be removed, regardless of the grounding on the power system. There's a couple of fixes for this. First, you could wire a 'fault reset' into an input terminal. In my experience, very few machine OEM's bothered to wire fault resets into the drives from the original build. While this could be done as a retrofit solution, there's an easier solution. There's a parameter, A092, called 'auto reset tries'. Thanks RoboBob, I set T105 to 1 and within a few minutes got an F114 fault, but I think I may have caused the microprocessor fault in the way I changed the parameter. I think I will install the factory jumper across the S+, S1 and S2 terminals to isolate the safety relay circuit. If I still get F059, it is most certainly internal to the drive.
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